Android Programming Lesson-2: JustJava

الهدف الرئيس من هذا الفيديو التعليمي هو التعرف على مفهوم variables & methods واستخدامهم في تطبيق بواسطة android studio والبرمجة بلغة الجافا بشكل مبسط جداً. وأيضا وفي السياق استخدام بسيط لـ constraint layout وتفعيل استخدام الأزرار buttons وكذلك system crash

الجزء التالي هو كود البرمجة بلغة الجافا والتي يفترض لصقها داخل الملف ActivityMain.java وذلك وفقا للفيديو التعليمي
/**
* IMPORTANT: Make sure you are using the correct package name.
* This example uses the package name:
* package com.example.android.justjava
* If you get an error when copying this code into Android studio, update it to match the package name found
* in the project’s AndroidManifest.xml file.
**/

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

import java.text.NumberFormat;

/**
* This app displays an order form to order coffee.
*/
public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void submitOrder(View view){

display(5);
displayPrice(quantity*2);

}

}
/**
* This method is called when the order button is clicked.
*/
public void display(int number) {
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText(“” + number);
}

/**
* This method displays the given price on the screen.
*/
private void displayPrice(int number) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
}

What is REST API? | Web Service

Java Rest API
Rest API in Spring Boot : https://goo.gl/5Wgsk6
Restful Web Services Tutorial : https://goo.gl/3mosnz
Spring Boot Tutorials : https://goo.gl/7894NE
In this video we will discuss about REST API.

We’ll see :
What is Web services
what is API
What is REST API
How REST works
Implementation of REST API

A REST API defines a set of functions to process requests and responses via HTTP protocol.

REST is used in mobile application as well as in web appliactions.

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Channel: Telusko Learnings
Published: 2017-06-14 15:02:36
Duration: 11M27S
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Top 5 Programming Languages to Learn in 2018 to Get a Job Without a College Degree

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Channel: Clever Programmer
Published: 2018-01-29 17:51:03
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How HashMap works internally || Popular java interview question on collection (HashMap)

In this tutorial, we are going to learn how hashmap works internally.This is a very popular java interview question from the collection framework and been asked so many times to check candidates understanding on Map collection.

I am going to cover three things in this series of tutorials which will cover a hashmap internal implementation.

1) We will see a detailed overview of how a map works internally when we use map.put(Key k, Value v )

2)Once we will have an overall idea we are going to debug
everything that we learned in this tutorial

3)In the last tutorial of this series, I will cover how the get method works internally ( map.get(Key K) )

So when we create a map object internally an array of buckets will be created with a size 16 (if we use the default constructor.)Then when we use the map.put method, internally the hashcode and the index will be calculated for the key and the key will be stored in a specific index.

In case of a hash collision, then the key with the same hashcode is going to be stored in the same index as each bucket is a node or a linked list.

Inside each bucket, four things are going to be stored as a form of a linked list.They are hashcode, key, value and the next (which hold the address of the next node with the same hashcode).

So lets understand everything diagrammatically because this is one of the very popular hashmap interview questions.So please put this question on your to-do list and better be prepared for it.

“How hashmap works internally in java with example”

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Channel: Selenium Express
Published: 2018-01-27 13:01:03
Duration: 19M40S
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أفضل طريقة لتتعلم البرمجة بدون معلم

يشرح هذه الفيديو الية تعلم البرمجة بالطريقة الحديثة
مع ذكر لبعض المواقع التعليمية المساعدة على ذلك:

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Channel: Dr Amjad
Published: 2018-01-16 17:50:53
Duration: 9M28S
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البرمجة ليست صعبة _تعلم البرمجة

البرمجة ليست بالامر الصعب لتعلمه فكر مرة أخري أذا كنت تعتقد هذا
البرمجة ليست صعبة _ تعلم البرمجة
TECHNOPHOBIC مع أحمد محمد | البرمجة ليست صعبة

الPost العالمي للمبرمج :-
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كيف تبدأ تعلم البرمجة , من أين تبدأ وماذا تتعلم :-
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ال50 مصدر لكل مبرمج :-
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كيف تتعلم البرمجة في 2017 :-
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المصادر العالمية و الاكثر أفادة لتعلم واتقان ال Data structure في جميع اللغات البرمجية :-
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مقدمة إلى برمجة ألعاب الفيديو :-
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بدايتك في عالم برمجة الالعاب و تطويرها :-
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تعلم البرمجة
البرمجة ليست صعبة

Channel: هفيدك تك | Hafedktech
Published: 2017-05-26 11:27:21
Duration: 3M2S
Views: 36612
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